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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58f2cb2dd44cdc0edbabd645f2a1f5e797deca1fa4a1c16371eb0d7634fe43d' 
  AND token = '/eQ/s9a28ybT+cD5Kv4ffCPGNfJfR/7fVTb90B+aoSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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