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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44315ea01380e4dc8df91e3739ee03ecee65d249526b8028587bf54de1127c6c' 
  AND token = 'Jhejtk6T+n5xGzOb3X9/uxDgmIq1FeOfVVwEe4Y+4fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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