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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb51e2c327fa82b297811366017cf1237f02517342455529440a75221393b1d0' 
  AND token = 'MNgbBwi7C5cvDMvNA8dQbCW1+No/tCiWm8YodPj7RJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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