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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2550ffdfe1018ddb61b8a2b538efdfa420d981a31507da96318c7a4356cafa' 
  AND token = 'goneYK08+KA/wVl9JaaMQCsRvV38bAo+MmdiXHYKiaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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