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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8c6203e87c1e6c16d8b648d715a49c5b852ec1990528d99d8106e7575710bc' 
  AND token = 'Rfig15aOAe/onSlsVpqMrUtg0j8Lz1jd7Csm9x/a+hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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