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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a2bc77b5fbade5ecc7761832ce337d89e5f7894cc16e908d655dc57dc13feb' 
  AND token = 'EP7EKwZWG5bms+GVhkqBLmCfA80Z/w8TPX7DTGSprng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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