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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088577b7ae1cb7f8af4174acf0814cdbe76d264e986ea95ce32f71e9acf0820a' 
  AND token = 'G+2Rei/RfyiXO6Alc4XCmNPJtjKb1nyKe/or1deitAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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