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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e20745d4976fe88a05ee4d133e5982d9314e93f8a0dfae178eabd3f8383927a' 
  AND token = 'SpO8fSusm7B4eK7ZHpgCZPljtIftZPxrdqJgDreh2wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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