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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda847eecdd5a812b596cdfcd8ff02bb9ff04afa98907786d90da0be65e9e40d' 
  AND token = 'LgUgiW8MwmRR0+WA74leXGRR6O3bKLEx1MZVUpZPKg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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