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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9eebafff5c8dd29ffae817e1d1c2c51f68c1b54a1b6ac3b0007a5d7a58352d5' 
  AND token = 'r5VsbBOGgrhOF37f02tqcq3ItxQ+1GCp3Pk7cpc7TTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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