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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8e10805b1dd81539ce7620b208385cedfca0069066c943ffa0558b5e4c9ef8' 
  AND token = 'nfo7cfMlqsT5ZzFAcl+ymQ3kt+HrJF6g4dwpaZFeyFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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