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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c0234a8fd3fe2472bd96a594d01b760369597bef27b390f87915699ae37dbc' 
  AND token = 'oSMCNM+vcv2VJSws/bsEsJHSofdq/Of5/8RC5CjdP/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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