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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fa7a2f6f1720031dc2f03f5453ac58f73e9abb80d8ded34beca44a173b70c1' 
  AND token = '4DH9jw/818YC5u7UwHEz1s/AvhiVijrfct5vhEOdD8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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