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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a2f05e262c2045e2f41b68ac868d174ed8935c5954910556670b4aeae41a90' 
  AND token = 'RwavtYyDbpZ8okBIyo3PLfAo72aIE2ldz9jmF0HMWis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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