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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f7a59f8e59837ccba781ade13fabe55e6ea0ec9727043f14579da281474d36' 
  AND token = 'D5TO14C1AsAecL54MNZGhZjq0G97zdjrJAV7Pgs4CZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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