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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d358ba6b7c3a0beaa032e759c5ce417090d213ffe0a11241c6fdeb50891846c' 
  AND token = 'zseJcGk3IM8yVxnldlBIFBWfqvqWjVOw2B0sbwlrmOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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