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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325c2b4ea1a4eedeb8e8ce55a9ca7326276616c7902141ec0dd7e3747107fa26' 
  AND token = 'qLFefJ7Jk0kzH77YVLNNdcTFXQtuDvEzfCTLikBNw3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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