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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd080e9f5cad8952240c1019f029cfbc385c83794e95b71271a996ce0f00c8c45' 
  AND token = 'kyli+BESECXpsjPX0MAvhVgyiUwOkzxAtLkuUmy5iSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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