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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26372cfbb3ea80b0562a61fad9898705e1aab2777d87d14ea765aac3826bea3a' 
  AND token = 'q0fu5Aa+KRWIqrVYyQ8M0nwc1bfmdpC/KSJXdSsQFL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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