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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb44414dfb3c486882653be23cad8e2a7e686a35af6c220d5a542d7bb62496a' 
  AND token = 'OOeyeZYyuXuQgsAo26CtMW0NGFGG6L0Lur2vZRvAoq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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