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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796915c6eb3ff692d99367f640e4f922813d315276ef93b758410ed9befddbad' 
  AND token = 'qN/s+3dD7bGzLK4agxocq2svjUMUD4R0oOTy8UsG8GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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