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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f406c3294486ac8079b11ff21f5585d99234e379291c5f4af45160ed5de44a' 
  AND token = 'nUGTFmGzKnQZKVzOQOJJ0NSkyrgO5vIzQ4C2MDVC45M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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