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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dc8f20a6bb6acb989ce5e25ecb7c6c36f90b14ecf12b32b590b8e12a80bc0a' 
  AND token = 'jxzIthGY97fXsnN4qokmNGW5D83PZWwmQhR1yk5yG9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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