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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b34c8104bbd058e2f5f14914775b96c3a3e69c14709df6e1097738b36bfec7' 
  AND token = 'nzoo2NSaYATkE3nAXu9F1tRP0dHlgBH/U3bm4A+Z3xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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