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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4fae4b431d79165469e0d38d344d0f6eccbe19897e7a47bd4f5ddaa4000ae9' 
  AND token = 'u8/bGPZuyh6hCDerZV6gdGwmJr9pFhWn2C/0o7hHCVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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