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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0bce8bce5af07aa06a369bb19d3c9a238a00f228864de292104fbab01fe305' 
  AND token = 'o4aeQDl8Xd6ZJWyQnZk5JYgOT0m8sBVuzZ0TQwCdPnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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