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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d39955d361a5c4e4e911355f749ae4150bd2cd2378219062216cf011c12b77' 
  AND token = '92DbBA042L1/OqK4MTwRUw21WC7G4gwPS1p6Q81bT/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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