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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711563e2861caa1f28a2d8f4eef3275b3b693083e9acf98f4f4eaa9d696208e0' 
  AND token = 'r7vmbizUfM3wgwBUZSeUcSzf176sXdiropgoghhzpQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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