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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61fda85266cb8ff2ac7709e6930b323bf8efc08a196d4299b765b5d5d79a3201' 
  AND token = 'wbxZjaViYLKC3pVTAMjvyBPyQ3Mqmu6r19PUec5xxAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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