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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5302d0d36968c1c471f1706b557d7943b9db00c5f3c02a603c0c7aff78327316' 
  AND token = 'ieYBe8tN2kzgBFo2REQ4DRZ1sv3a8lIc5ZKMYwu4oh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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