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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0264bf70146825d05c4e2283254ec2d74cb38ee7c38ef47ade8e86227679cbe' 
  AND token = 'Cu53ELH9mVosZrWOSJ/L9TM/exDktWuwd3U5VT99etw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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