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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccfc7b26c6776f6316e4ecb84c5d93a9d3cd8092389cc267eed412296dbad58' 
  AND token = 'bjhHOc3VXSLkmIYYiu2w8WvtVx9nzii7suGIbBP9Vqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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