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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f10534b81ddb883e2749d77a4082722358596e48c86e61c963443c9ceeb9ba8' 
  AND token = 'xtRWoOcw0LeP9wUfYWzNjPHKtrKJu39Ec/4I4jkQb7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}