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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672c876ed032653a44517ed4eaf299ef153a99c32a2e25b73ee8db36650b8cde' 
  AND token = 'SWIJVeYkIvyNk6fCwJjB6MZ+dZpw/ZJbaQ9o846BxWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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