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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4c9ab4cea9aeed14bd2e19708483e809a6ba38ed0b8474aae4d0b23cbe1ebe' 
  AND token = 'QUXDNlhG8RD5ozrp3wzVw3s/b+CnD3Rw/Duk1IgVHDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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