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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f4727344ec5df6374ffef927e450d848083f7f1b4c9b3cd2709cbbdc766411' 
  AND token = 'D/yr/2j+gu9OWkldXiWuOYD8sRs3B9iyWmGuFyPu1s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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