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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca30fd0db4919c20a6b41e8446f426450f719c2811e1d19d180c6c858915f6d' 
  AND token = 'TavjuaBW21J3ebSt5/vPV4G4NVddq/1uiN2D5hclXK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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