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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db98dc39a9f03ea28d185ef4a3f02c0632de39da2cbcc64e13fb07ae5973b857' 
  AND token = 'bb+SYFGswx8D5FKDR+I090SSfMGXKpHGmB0ND2J3EGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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