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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703c134e57bb56f3748490be0ebaf161f879014a7ddcc76d00b1cca842efbf3e' 
  AND token = 'wr8itrYHxRhy/b0+6ptJe6qYIseJuMIkoZx8lMiGim8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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