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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773268be29b469d22d5a20f0c505fbb38ac52ff09f27563c22a748e56db77052' 
  AND token = 'u4kO+JrxpPBCrITQMzCM0RclfqkXCFykSKmnhmhrY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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