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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48d68c1d3806b60cb811a533a96383513d2867607557395e0455bf05954890f' 
  AND token = 'C/qAka/VhiPtwCnzm0ucIK7MatwaYHR1udeDObbxnik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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