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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c3676ae39852602b84637ea570d58c755d86f55cc9bcf7f908ec28c600cb6b' 
  AND token = 'Y0q2JMInYMSkiK/RVyz37AvbwO8zRnHMwyCr5I1Ko00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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