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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7920e0ccd3167496587a2cb4c0995ac19277f3842911abbf74e215dcb3fd2a3' 
  AND token = 'BZT7NcSVyuPOCEIBwkpnlH8X0T9kN2Hh8b0N4CBhwjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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