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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376b03c652ca1bb0754a606579c508d5ed10571cf91d98e3edd4fa7d719ae2a4' 
  AND token = '03IwtLY+L5faF13h3MXTIJFbk9h4F6rt/8mlS018QgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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