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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5579eaed190485f0c2ea5a0862f2c68c34baba10917cef26d0232de49a535500' 
  AND token = '4royBEYf6qvdqXFZ7rYQGTb6n8lejHkhwpDPf1QLZqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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