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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bb576d9a96ec9f11289027334dd9283e666225bbfa1d416a35831beeba86ac' 
  AND token = 'tSVyEcNc++EmGyQvfCgFBoM2QC1s7FrfWA2wZD4tLNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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