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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a1917b6603dd38ade2949a0beb350de37ebf1cf3b0e87957a1cc599f5cafda' 
  AND token = 'j6dvkpNwjWKQNnmzy8jQL49AuJvWH6vtoHqY8RoNAWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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